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C l a s s 1 0 Areas Related to Circles
Page 2


C l a s s 1 0 Areas Related to Circles
W h a t i s a s e c t o r ? W h a t i s a s e g m e n t ? W h a t i s a n a r c ? H o w t o c a l c u l a t e t h e i r a r e a s a n d l e n g t h s . E x a m p l e p r o b l e m s . What Will We Learn Today?
Page 3


C l a s s 1 0 Areas Related to Circles
W h a t i s a s e c t o r ? W h a t i s a s e g m e n t ? W h a t i s a n a r c ? H o w t o c a l c u l a t e t h e i r a r e a s a n d l e n g t h s . E x a m p l e p r o b l e m s . What Will We Learn Today?
A s e c t o r i s t h e p a r t o f a c i r c l e e n c l o s e d b y t w o r a d i i a n d t h e a r c b e t w e e n t h e m . What is a Sector?
M i n o r S e c t o r : S m a l l e r p a r t o f t h e c i r c l e . M a j o r S e c t o r : L a r g e r p a r t o f t h e c i r c l e . T y p e s :
Page 4


C l a s s 1 0 Areas Related to Circles
W h a t i s a s e c t o r ? W h a t i s a s e g m e n t ? W h a t i s a n a r c ? H o w t o c a l c u l a t e t h e i r a r e a s a n d l e n g t h s . E x a m p l e p r o b l e m s . What Will We Learn Today?
A s e c t o r i s t h e p a r t o f a c i r c l e e n c l o s e d b y t w o r a d i i a n d t h e a r c b e t w e e n t h e m . What is a Sector?
M i n o r S e c t o r : S m a l l e r p a r t o f t h e c i r c l e . M a j o r S e c t o r : L a r g e r p a r t o f t h e c i r c l e . T y p e s : How to Find the Area of a Sector
Y o u k n o w t h a t a r e a o f a c i r c l e o f r a d i u s r i s p r ² . I m a g i n e t h e c i r c u l a r r e g i o n f o r m e d b y t h e c i r c l e a s a s e c t o r o f a n g l e 3 6 0 ° ( B e c a u s e a n g l e a t t h e c e n t r e i s a c o m p l e t e a n g l e ) . W i t h t h i s a s s u m p t i o n , w e c a n c a l c u l a t e t h e a r e a o f t h e s e c t o r O A P B a s f o l l o w s : A r e a o f a s e c t o r o f a n g l e 3 6 0 ° = p r ² S o , a r e a o f a s e c t o r o f a n g l e 1 ° = H e n c e , a r e a o f a s e c t o r o f a n g l e = =
O
A
P
B
Page 5


C l a s s 1 0 Areas Related to Circles
W h a t i s a s e c t o r ? W h a t i s a s e g m e n t ? W h a t i s a n a r c ? H o w t o c a l c u l a t e t h e i r a r e a s a n d l e n g t h s . E x a m p l e p r o b l e m s . What Will We Learn Today?
A s e c t o r i s t h e p a r t o f a c i r c l e e n c l o s e d b y t w o r a d i i a n d t h e a r c b e t w e e n t h e m . What is a Sector?
M i n o r S e c t o r : S m a l l e r p a r t o f t h e c i r c l e . M a j o r S e c t o r : L a r g e r p a r t o f t h e c i r c l e . T y p e s : How to Find the Area of a Sector
Y o u k n o w t h a t a r e a o f a c i r c l e o f r a d i u s r i s p r ² . I m a g i n e t h e c i r c u l a r r e g i o n f o r m e d b y t h e c i r c l e a s a s e c t o r o f a n g l e 3 6 0 ° ( B e c a u s e a n g l e a t t h e c e n t r e i s a c o m p l e t e a n g l e ) . W i t h t h i s a s s u m p t i o n , w e c a n c a l c u l a t e t h e a r e a o f t h e s e c t o r O A P B a s f o l l o w s : A r e a o f a s e c t o r o f a n g l e 3 6 0 ° = p r ² S o , a r e a o f a s e c t o r o f a n g l e 1 ° = H e n c e , a r e a o f a s e c t o r o f a n g l e = =
O
A
P
B
E x a m p l e :
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FAQs on PPT: Areas Related to Circles - Mathematics (Maths) Class 10

1. What is the formula for the area of a circle?
Ans. The formula for the area of a circle is A = πr², where A represents the area and r is the radius of the circle.
2. How do you find the circumference of a circle?
Ans. The circumference of a circle can be found using the formula C = 2πr, where C represents the circumference and r is the radius of the circle. Alternatively, if you know the diameter (d), you can use the formula C = πd.
3. What is the relationship between the radius and diameter of a circle?
Ans. The radius of a circle is half the length of the diameter. This means that if you know the diameter, you can find the radius by dividing the diameter by 2 (r = d/2).
4. How do you calculate the area of a sector of a circle?
Ans. The area of a sector of a circle can be calculated using the formula A = (θ/360) × πr², where A is the area of the sector, θ is the angle in degrees, and r is the radius of the circle.
5. What is the significance of π (pi) in circle calculations?
Ans. π (pi) is a mathematical constant that represents the ratio of the circumference of a circle to its diameter. It is approximately equal to 3.14 and is essential in formulas for calculating the area and circumference of circles.
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